The iOptron HAE43B-EC combines the two most advanced versions of the HAE43 platform into one mount: the integrated iMate imaging computer of the B model and the high-precision RA encoder of the EC.
The mount head weighs just 12.8 lb (5.8 kg), yet iOptron rates it to carry 44 lb (20 kg) without a counterweight and up to 55 lb (25 kg) with the optional counterweight system. Inside the same compact package is a 64-bit ARM-based computer running KStars, Ekos, and INDI, while the right-ascension axis adds a high-precision encoder with iOptron's Real-Time Periodic Error Correction.
Those two features solve different parts of the portable-imaging problem. The encoder reduces the tracking error the guider has to deal with. The iMate computer reduces the amount of external hardware and cabling you need to bring into the field.
You can build an entire imaging system around the computer already inside the mount, or connect your own PC directly through USB-C. You can guide conventionally, experiment with encoder-assisted unguided imaging where the image scale allows it, or use the encoder and guider together for more demanding systems.
Features
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High-precision RA encoder with Real-Time PEC. The encoder continuously monitors right-ascension motion and allows the mount to correct much of the tracking error generated by the strain-wave drive in real time.
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Built-in iMate imaging computer. A 64-bit ARM-based onboard computer comes preloaded with KStars, Ekos, INDI drivers, and iPolarServer, allowing the mount to control much of an automated imaging system without a separate computer at the telescope.
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44 lb counterweight-free capacity. Carry up to 20 kg (44 lb) without a traditional counterweight shaft and weights.
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Up to 55 lb with a counterweight. Add the optional counterweight system when a heavier or more demanding telescope configuration calls for additional capacity.
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Only 12.8 lb for the mount head. A substantial imaging payload in a package that remains genuinely portable.
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Strain-wave gearing on both axes. The RA axis uses a 640:1 reduction and DEC 480:1, providing high torque from a compact drive system.
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32GB onboard storage. iMate includes 32GB of eMMC storage and supports a microSD card up to 64GB for additional image and system storage.
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Integrated USB and accessory power. iMate provides one USB 3.0 port, two USB 2.0 ports, and three 12V outputs, two of which can be switched through the iMate software.
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Remote operation over Wi-Fi. Access the onboard iMate computer from Windows, macOS, Linux, iOS, or Android using NoMachine remote-access software.
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Direct USB-C mount control. Prefer NINA, another external imaging computer, or your existing software environment? The HAE43B-EC can also be controlled directly through the USB-C connection on the mount base.
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Equatorial and Alt-Az operation. Use EQ mode for astrophotography and tracking or configure the mount in Alt-Az mode for visual observing.
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Dual Vixen/Losmandy-D saddle. Accepts either of the two common astronomy dovetail standards without requiring a replacement saddle.
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Integrated ST-4 autoguider port. Traditional autoguiding remains available in addition to software-based guiding through the imaging-control system.
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Electronic friction brake. Designed to stop mount movement safely during a planned or unexpected interruption in power.
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Automatic zero-position search. Built-in sensing allows the mount to locate its reference position electronically.
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Optional iPolar. iOptron's electronic polar-alignment camera can be added when you want a dedicated polar-alignment solution.
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Aluminum carrying case included. A fitted case protects the mount during transport and suits a system designed to move between home and dark-sky sites.
Encoder-Assisted Tracking
The EC designation is about what happens on the right-ascension axis.
Strain-wave gearing allows the HAE43 to carry several times its own weight without requiring a traditional counterweight system, but its tracking error behaves differently from the comparatively smooth error of a conventional worm gear.
The HAE43B-EC addresses that with a high-precision RA encoder and iOptron's Real-Time Periodic Error Correction. The encoder continuously measures RA motion and allows the mount to correct much of the strain-wave drive's tracking error internally rather than waiting for an external guider to detect it.
iOptron says the resulting tracking accuracy is sufficient that many users may choose to image without guiding. Whether that makes sense for your system depends on focal length, pixel scale, exposure time, polar alignment, and how demanding you are about star shape.
At shorter or more forgiving image scales, unguided imaging may be practical. At longer focal lengths or finer pixel scales, guiding can still provide the additional correction needed for consistent long-exposure work.
The real advantage is that a guider is starting with an RA axis that is already being actively corrected.
iMate Puts the Imaging Computer Inside the Mount
The “B” side of the HAE43B-EC solves a completely different problem: all the extra hardware that begins accumulating around an astrophotography system.
Normally, the telescope eventually acquires another box — a laptop, mini PC, Raspberry Pi, or dedicated astronomy controller — to run the camera, guider, focuser, filter wheel, sequencing software, plate solving, and image storage.
iMate moves that computer into the mount.
The 64-bit ARM-based system comes preloaded with KStars, Ekos, and INDI support for compatible cameras, guide cameras, focusers, filter wheels, and other equipment. It includes 32GB of internal eMMC storage plus a microSD slot supporting cards up to 64GB.
One USB 3.0 port, two USB 2.0 ports, and three 12V outputs let much of the imaging equipment connect directly to the iMate rather than requiring a separate hub and power distribution box hanging from the tripod.
Once the equipment profile is configured, Ekos can handle GoTo, plate solving, autofocus, guiding, capture sequences, and other parts of an automated imaging session while the software itself runs on the computer inside the mount.
Control It Remotely
You don't need to stand beside the HAE43B-EC with a laptop open in the dark.
iMate creates its own Wi-Fi network and is accessed using NoMachine remote-access software. NoMachine is available for Windows, macOS, Linux, iOS, and Android, so the screen in your hand can simply become the display and keyboard for the computer already running on the mount.
Open KStars and Ekos remotely, start the imaging sequence, and let the onboard computer do the work.
The iMate hardware also includes a LAN connection for customer DIY applications, but most portable users will work through its Wi-Fi connection.
You Are Not Locked Into iMate
One of the better aspects of the design is that buying the integrated computer does not force you to use it forever.
The HAE43B-EC can also be controlled directly through the USB-C port on the mount base. Windows users can work through iOptron Commander and ASCOM, while compatible INDI software provides options for macOS, Linux, and Raspberry Pi systems.
If you already have a NINA-based mini PC, dedicated controller, or another workflow you prefer, the HAE43B-EC can operate like a conventional computer-controlled mount and let your existing system remain in charge.
If you want the cleanest portable package, switch back to iMate.
44 Pounds Without Counterweights
The encoder and onboard computer don't change the fundamental appeal of the HAE43 platform: it carries a remarkable amount of equipment for a mount weighing less than 13 pounds.
iOptron rates the HAE43B-EC for 44 lb (20 kg) without a counterweight and 55 lb (25 kg) with the optional counterweight system.
There is an important qualification to those numbers. The published rating assumes the payload's center of gravity is approximately 200mm from the RA rotation axis. A compact 35-pound SCT or astrograph and a long 35-pound refractor do not place the same mechanical load on the drive.
That makes telescope geometry just as important as scale weight. The HAE43B-EC is particularly well suited to compact astrographs, SCTs, and medium-to-large refractors with reasonably concentrated imaging trains. As the optical tube becomes longer, leaving more margin below the published payload becomes increasingly sensible.
The optional counterweight system gives you another tool when a particular configuration benefits from it, but properly sized systems can take full advantage of the counterweight-free design.
Guiding an Encoder-Equipped HAE43
The RA encoder changes the way you may want to approach guiding.
On a non-encoder strain-wave mount, relatively frequent guide corrections are often useful because the guider has to follow the drive's tracking error directly. On the HAE43B-EC, the encoder is already making RA corrections internally through Real-Time PEC.
That means there is no reason to assume the fastest possible guide cadence will always produce the best result.
Seeing conditions, guide-camera sensitivity, focal length, image scale, guiding software, DEC behavior, and the telescope itself all affect the optimum settings. An encoder does not remove the need to tune the complete system.
Start with reasonable settings, let the encoder do its job, and judge the results from the actual subframes. Round stars and consistently good image quality matter more than chasing the smallest possible RMS number on a guide graph.
From the Cloudy Nights Community
Discussion among HAE43 and HAE43EC owners on Cloudy Nights gives the encoder story some useful real-world perspective.
Owners have successfully used encoder-equipped HAE43 mounts with systems ranging from shorter refractors to C8 EdgeHD and 10-inch RC-class telescopes. There are reports of excellent guided performance once the complete system is dialed in, including long imaging sessions where very few subframes were lost to guiding excursions.
The community experience also shows why we would not reduce the EC version to a single promised RMS number. Some owners saw disappointing guiding at first and improved it substantially after working through PHD2 settings, DEC behavior, telescope position, and pier or tripod rigidity. Others have had good results with relatively quick guide corrections. There is no one setting that turns every HAE43EC into the same mount under every telescope.
That's useful information rather than a criticism. The encoder meaningfully improves the RA tracking platform, but guiding performance still belongs to the complete system — mount, telescope, support, guider, software, seeing, and setup.
The iMate side of the B version addresses another issue owners frequently discuss: reducing the number of separate computers and control boxes in a portable rig. KStars, Ekos, INDI, USB connectivity, accessory power, and image storage are already inside the mount. For someone who sets up and tears down regularly, that integration can be as valuable as the reduction in mount weight.
EQ for Imaging, Alt-Az for Visual
The HAE43B-EC is primarily aimed at astrophotography, but it does not have to spend every clear night underneath a camera.
In equatorial mode, polar alignment provides the geometry required for long-exposure imaging. The encoder, Real-Time PEC, and optional guiding then handle the tracking side of the system.
Configure the mount in Alt-Az mode and it becomes a high-capacity GoTo visual platform without requiring a normal polar-alignment routine.
That can make a substantial refractor or SCT far more convenient for visual use. The same telescope that collects several hours of data one night can be pointed at the Moon, planets, globular clusters, or double stars with an eyepiece the next.
What's Included
- iOptron HAE43B-EC strain-wave AZ/EQ mount head
- High-precision RA encoder with Real-Time PEC
- Integrated iMate computer
- Dual Vixen/Losmandy-D dovetail saddle
- USB-C computer/firmware cable
- 12V AC/DC power adapter for indoor use
- Aluminum carrying case
Available separately: external iPolar electronic polar scope, Go2Nova 8411 OLED hand controller, LiteRoc tripod, Tri-Pier, counterweight shaft and counterweight, MiniPier extension, iGuider, and other compatible accessories.
Frequently Asked Questions
What does the EC version add to the HAE43B?
The HAE43B-EC adds a high-precision encoder to the RA axis along with iOptron's Real-Time Periodic Error Correction. Both versions include the iMate computer; the encoder is what separates the EC model.
Does the encoder eliminate the need for guiding?
Not necessarily. iOptron says its tracking accuracy is good enough that many users may choose to image without guiding, and that can be practical at suitable focal lengths and image scales. More demanding long-exposure systems may still benefit from guiding.
Can I still guide normally?
Yes. The HAE43B-EC includes an ST-4 autoguider port and also supports software-based guiding through compatible imaging software. Guiding strategy should be tuned to the telescope and image scale rather than chosen simply because the mount has an encoder.
What is iMate?
iMate is the astronomy computer built into the mount. It uses a 64-bit ARM platform and comes preloaded with KStars, Ekos, INDI drivers, and iPolarServer so it can control compatible imaging cameras, guide cameras, focusers, filter wheels, and other equipment.
Can I really image without a laptop beside the telescope?
Yes. The imaging applications run on the onboard iMate computer. You still need a phone, tablet, or computer to access and configure the system remotely, but the computer performing the imaging work is already inside the mount.
How do I access iMate?
The mount creates an iMate Wi-Fi network. Connect to it from a compatible device and use NoMachine remote-access software to operate KStars, Ekos, and the other applications running on the onboard computer.
Do I have to use iMate?
No. The mount can also be controlled directly through its USB-C connection using an external computer and compatible ASCOM or INDI software.
How much can it carry?
iOptron rates the HAE43B-EC for 44 lb (20 kg) without a counterweight and 55 lb (25 kg) with the optional counterweight system. The payload rating assumes the center of gravity is approximately 200mm from the RA axis, so telescope geometry matters in addition to weight.
Does it include iPolar?
No. iOptron's external iPolar electronic polar scope is available separately. The iMate computer does include iPolarServer for use when an iPolar camera is connected.
Can it be used for visual observing?
Yes. The HAE43B-EC can operate in Alt-Az mode for visual use as well as equatorial mode for astrophotography.
Final Thoughts
The HAE43B-EC is the most complete version of the HAE43 because its two major upgrades solve two entirely different problems.
The high-precision RA encoder improves the tracking behavior of the strain-wave drive. The iMate computer puts KStars, Ekos, INDI device control, image storage, USB connectivity, and accessory power directly into the mount.
Underneath all of that is still the feature that makes the HAE43 unusual: 44 pounds of counterweight-free payload in a mount head weighing less than 13 pounds.
You can build a self-contained imaging system around iMate and leave the field laptop behind, or connect the external computer and software you already prefer. You can let the encoder carry more of the RA tracking workload, guide when the image scale calls for it, and add a counterweight when a particular telescope configuration benefits from one.
For an imager who wants the most capable HAE43 package without giving up the portability that made strain-wave mounts attractive in the first place, that combination is the reason the HAE43B-EC exists.
